Valve adjustment advice needed

Hopefully the excess clearance isn't from a cam lobe going south.

BTW, why is "going south" a bad thing? I like the south.:) Tennessee was T shirt weather on Tuesday, and I came home to white crap all over my driveway.:mad:
 
Could also be a lifter is loose in the block, from 80 years of use. I had one like that and it would tick about 3 times, then quiet for awhile, then tick some more. Chrysler tappets solved the problem, they are 5/8" stem diameter.
 
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